Don't show the invalid characters from string when copy paste in text box

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Dear All,

I have created Windows form with multiple Text boxes.

one of those text box does not accept the following characters like '=', '\' .

If user enters these characters, need to display a balloon pop-up message as 'The following characters are not valid: \ = ".

I have done this in 'Key Pressed' event to prevent these characters and displayed message.

But, while doing Copy Paste these invalid characters in text box, first it displays all the characters and then it removes invalid characters. (Since in 'Text changed' event, i have read the one by one and then removing invalid characters). and displayed a balloon message.

How to don't show the invalid characters from string even if i copy paste in text box.
(Ex: 'xyz=fg\') it should display only 'xyzfg' and balloon pop-up message.

Any help on this?

Thanks in advance.

Posted 9-Dec-14 23:48pm

sdileep1

Updated 17-Dec-14 23:12pm

v2

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BillWoodruff 11-Dec-14 1:16am

Yes, it's possible to filter a paste into a TextBox. And using 'TextChanged will potentially be very slow.

Before I post a solution, with code, let me ask you if you need to filter all of your TextBoxes in the same way, or are there different types requiring different types of filtering ?

sdileep1 11-Dec-14 23:54pm

Filter is different in all the text boxes.

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Sharma Richa · Answer 1 · 2014-12-09T23:54:00

Try this

C#

$('#txtname').bind('keypress', function (event) {
          var regex = /[!`~:;"'\^*%${}[\]#&())_?\\<>+/|]/gi;
          var key = String.fromCharCode(!event.charCode ? event.which : event.charCode);
          if (regex.test(key)) {
              event.preventDefault();
              return false;
          }
      }).bind('paste', function (event) {

          var el = $(this);
          setTimeout(function () {
              var regex = /[!`~:;"'\^*%${}[\]#&())_?\\<>+/|]/gi;
              var text = $(el).val();
              if (regex.test(text)) {
                  $(el).val('');
                  return false;
              }
          }, 100);
      });